spring实例化的三种方式

第一，使用类构造器实例化：

<bean id="personService" class="com.jack.service.impl.PersonService"></bean>

第二，使用静态工厂方法实例化：

<!--配置文件-->
<bean id="personService1" class="com.jack.service.impl.PersonServiceFactory"
		 factory-method="createPersonService"></bean>
//java代码
public class PersonServiceFactory {
	public static PersonService createPersonService(){
		return new PersonService();
	}
}

第三种，通过实例工厂实例化：

<bean id="personServiceFactory" class="com.jack.service.impl.PersonServiceFactory"></bean>
<bean id="personService2" factory-bean="personServiceFactory" 
		factory-method="createPersonService2"></bean>


public PersonService createPersonService2(){
		return new PersonService();
	}